The catalytic converter in your Nissan Murano is built to properly expel the impurities the engine emits. In time however, many factors such as old age, physical damage, and clogs affect its performance. This in turn leads to various car problems such as noises under the vehicle, engine overheating, and failing your emission test. If these issues show up, then spend some time diagnosing your catalytic converter before worse problems come up. Listed below are some common troubles your Nissan Murano encounters related to catalytic converters, as well as their causes:
If you start to feel something rattling or shaking in your vehicle, check your catalytic converter if it has shrunk in size. This happens when it completely heats up, then immediately comes into contact with something of an extreme opposite temperature, like snow or really cold water. This creates cracks around the car part, forcing the housing to adapt by contracting. If you drive around cold climates, then there are high chances of this happening. If this is the case, then just simply replace the housing and the noise would stop.
When your car tends to overheat and you experience a decrease in fuel economy, your catalytic converter might be plugged. This problem restricts the flow in your exhaust system, increasing the backpressure and lowers the maximum speed your vehicle achieves. If unchecked, your engine will continue to run hot and possibly go bust, adding more problems. What you should do is take out the converter and flash a light on one end. If you are barely able to see anything or not at all through the honeycomb, then it is clogged and you might need to replace your catalytic converter.
Higher than normal emissions, as well as them developing a rotten smell, is likely the result of a substance contaminating the catalytic converter. There are various causes to this, such as an overly rich mixture of fuel from the engine, or a foreign substance such as antifreeze, oil and sealant entering the exhaust flow. Any of these would greatly damage your catalytic converter. If you see these kinds of problems, then it is probably time to replace your catalytic converter.